<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>login</title>
</head>

<style>
  .login {
    width: 400px;
    height: 400px;
    margin: 0 auto;
  }

  .login>.btn {
    margin:
  }
</style>

<body>
  <div class="login">
    <div>
      <h1>登录</h1>
    </div>
    <div>
      <div>
        <span>用户名:</span>
        <input type="text">
      </div>
    </div>
    <div>
      <span>密码:</span>
      <input type="password">
    </div>
    <div>
      <button class="btn">登录</button>
    </div>
  </div>
</body>


</html>